Following the group’s performance of “Boss,” Cabello departed the stage for what her band mates called a wardrobe malfunction. However, Cabello never returned to the Hollywood Casino Amphitheatre stage, forcing Fifth Harmony to perform the concert’s remaining seven songs as a quartet, including their hit “Work From Home,” the St. Louis Post-Dispatch reported.

On Saturday, Cabello posted a Snapchat video explaining her absence. “Hi Missouri, sorry I couldn’t finish the set last night,” she began the video. “Was having too much anxiety and couldn’t finish it… I’m truly sorry.” The singer also tweeted on Friday, “just wanna sleep for 3 days.”

As Billboard notes, Cabello has admitted to suffering anxiety in the past. “I was having terrible anxiety, nonstop,” Cabello said in 2015. “My heart would beat really fast the whole day. Two hours after I woke up, I’d need a nap because my body was so hyperactive. It was so eff – sorry, but it was so fucked up. I was scared of what would happen to me, of the things my brain might tell me. I realized the stuff I thought was important isn’t worth my health. Now I write in a diary every day, work out and meditate.”